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I was told recently that "it is well known that processes like $WW\to t\bar{t}$ ($t$ being a top, or any massive fermion) grows linearly with the energy in the absence of an Higgs boson." Does anyone know of a reference? The only ones I can find regarding the growth of $WW \to f\bar{f}$ are about the old argument for having a neutral current, i.e. $WW \to f\bar{f}$ cross-section grows if $Z$-mediated diagrams are not included.

Many thanks in advance.

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In case you're just looking for support of the unitarity violation argument, the more common example is that WW->WW scattering violates unitarity at the TeV scale. –  luksen Feb 22 '12 at 12:16
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@luksen Thanks, but I already know about the WW->WW scattering (see arxiv:1107.1501). –  Amitabha Feb 23 '12 at 1:42
    
I should say that I don't believe that the Higgs has anything to do with the growth of WW -> ffbar, since the chiralities of the outgoing fermions are different with and without the Higgs. Still, I may have missed something. –  Amitabha Feb 23 '12 at 1:49
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